A. RIGID FRAME SYSTEMS RCS FRAMING SYSTEM
RCS (Rigid Frame Clear Span):- These types of frames are provided for the widest possible spans without interior columns. These are economical in respect of use of space specially for machine arrangement and certain requirements.

RMS-X FRAMING SYSTEM
RMS [Rigid Frame Multi Span, RMS-X (X=number of interior spans)]:- These types of frames are ideal for wide buildings when some interior columns are acceptable. RMS may be used with `Z’ purlins for maximum economy on bay spacing of 40 feet or with bar joist roof purlins to achieve large, column free areas. Optional interior columns may be pipes, which provide maximum strength while occupying minimum floor space.

RSSCS FRAMING SYSTEM
RSSCS (Rigid Frames Single Slope Clear Span):- These types of frames are ideal for structures that have drainage restrictions such as a strip shopping centers or places where architectural requirements prohibits a gable appearance (requires the use of end wall parapets).

RSSMS-X FRAMING SYSTEM
RSSMS (Rigid Frame Single Slope Multi Span):- These types are of frames have the same features as RSSCS building; exception is that these frames have interior columns. RSSMS, single slope frames may be used with bar joist to achieve large, column-free areas.

RLCS FRAMING SYSTEM
RLCS (Rigid Frame Lean-to Clear Span):- These types of frames are ideal for use as office structures attached to large buildings. RLCS frames are well suited for use with architectural accessories such as overhangs and fascias. RLCS framing is an economical solution for the expansion of existing buildings.

RFR FRAMING SYSTEM
RFRF (Rigid Frame Rising Frame):- These types of frames have 1:2 roof slope with a clear span to maintain high vertical clearance. The tapered column rigid building system can adopt bypass sidewall runner. Applications of this type of framing system can be practiced with maintains, gymnasiums, tennis courts or airport hangars.

RMG FRAMING SYSTEM
RMG (Rigid Frame Multi Gable):- These types of frames are very essential when parapet or vertical fascias are used to cover the ridge line having large building width. One disadvantage of such type of building is adopting water drainage system, but in such a case providing under drain on the floor, the problem can be solved.

C S W F FRAMING SYSATEM
CSWF (Curved Solid Web Framing):- These types of frames are almost unique for architectural view as well as for ideal use of large span of the building. Without larger web depth of the rafter, considering other building system this is highly used in modern building structure.

C O W F FRAMING SYSTEM
COWF (Curved Open web Framing):- These types of frames are economic building structures similar to CSWF frame system. Instead of solid web of steel, here structural ERW tubes are mainly used as top members. Sometimes structural angles may be used replacing all those members.

B.SPACE FRAME SYSTEM
Skeleton 3D frameworks consisting of pins or welded connections with round or rectangular hollow steel sections (HSS) are generally designed as space frame. Architects while designing a steel structure are very conscious about space, shape, forms and aesthetic view. Space frame structures are only solution of their worries. Two basic elements of space frame structures, the top module in shape of square, rhombus, rectangular and triangular base along with similar shape bottom module of a double layer space frame.